Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/node_modules/redux-devtools-extension/index.js

@@ -0,0 +1,22 @@
+'use strict';
+
+var compose = require('redux').compose;
+
+exports.__esModule = true;
+exports.composeWithDevTools =
+  typeof window !== 'undefined' && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
+    ? window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__
+    : function () {
+        if (arguments.length === 0) return undefined;
+        if (typeof arguments[0] === 'object') return compose;
+        return compose.apply(null, arguments);
+      };
+
+exports.devToolsEnhancer =
+  typeof window !== 'undefined' && window.__REDUX_DEVTOOLS_EXTENSION__
+    ? window.__REDUX_DEVTOOLS_EXTENSION__
+    : function () {
+        return function (noop) {
+          return noop;
+        };
+      };